﻿using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace BRS.BidModule
{
    /**/
    /// <summary>  
    /// 申明委托  
    /// </summary>  
    /// <param name="e"></param>  
    /// <returns></returns>  
    public delegate int EventPagingHandler(EventPagingArg e);
    /**/
    /// <summary>  
    /// 分页控件呈现  
    /// </summary>  
    public partial class Pager : UserControl
    {
        public Pager()
        {
            InitializeComponent();
        }
        public event EventPagingHandler EventPaging;
        /**/
        /// <summary>  
        /// 每页显示记录数  
        /// </summary>  
        private int _pageSize = 50;
        /**/
        /// <summary>  
        /// 每页显示记录数  
        /// </summary>  
        public int PageSize
        {
            get { return _pageSize; }
            set
            {
                _pageSize = value;
                GetPageCount();
            }
        }

        private int _nMax = 0;
        /**/
        /// <summary>  
        /// 总记录数  
        /// </summary>  
        public int NMax
        {
            get { return _nMax; }
            set
            {
                _nMax = value;
                GetPageCount();
            }
        }

        private int _pageCount = 0;
        /**/
        /// <summary>  
        /// 页数=总记录数/每页显示记录数  
        /// </summary>  
        public int PageCount
        {
            get { return _pageCount; }
            set { _pageCount = value; }
        }

        private int _pageCurrent = 0;
        /**/
        /// <summary>  
        /// 当前页号  
        /// </summary>  
        public int PageCurrent
        {
            get { return _pageCurrent; }
            set { _pageCurrent = value; }
        }

        /// <summary>  
        /// 设置页面大小  
        /// </summary>  
        private void GetPageCount()
        {
            if (this.NMax > 0)
            {
                this.PageCount = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(this.NMax) / Convert.ToDouble(this.PageSize)));
                lblPageCount.Text = " 总共 " + PageCount.ToString() + "页，";
                lblPageCount1.Text = "每页" + PageSize.ToString() + " 条记录 ";
                // lblPageCount1.Text = "Page no: " + PageSize.ToString() + ",Total:" + PageCount.ToString() + " pages";  
            }
            else
            {
                this.PageCount = 0;
            }
        }

        /**/
        /// <summary>  
        /// 翻页控件数据绑定的方法 关键是这步，都是调用这里  
        /// </summary>  
        public void Bind()
        {
            if (this.EventPaging != null)
            {
                this.NMax = this.EventPaging(new EventPagingArg(this.PageCurrent));
            }

            if (this.PageCurrent > this.PageCount)
            {
                this.PageCurrent = this.PageCount;
            }
            if (this.PageCount == 1)
            {
                this.PageCurrent = 1;
            }
            lblcurentpage.Text = "当前处在第" + PageCurrent.ToString() + "页";
            lblRecordCount.Text = "共有 " + NMax.ToString() + " 条记录";
            // lblRecordCount.Text = "Total: " + NMax.ToString() + " records";  


            btnPrev.Enabled = true;
            btnFirst.Enabled = true;
            btnLast.Enabled = true;
            btnNext.Enabled = true;

            if (this.PageCurrent == 1)
            {
                this.btnPrev.Enabled = false;
                this.btnFirst.Enabled = false;
            }


            if (this.PageCurrent == this.PageCount)
            {
                this.btnLast.Enabled = false;
                this.btnNext.Enabled = false;
            }

            if (this.NMax == 0)
            {
                btnNext.Enabled = false;
                btnLast.Enabled = false;
                btnFirst.Enabled = false;
                btnPrev.Enabled = false;
            }
            //cmbPagecount.Items.Clear();  
            //for (int i = 1; i <= PageCount; i++)  
            //    cmbPagecount.Items.Add(i.ToString());  
            //cmbPagecount.SelectedIndex = PageCurrent - 1;  

        }
        /// <summary>  
        /// 首页  
        /// </summary>  
        /// <param name="sender"></param>  
        /// <param name="e"></param>  
        private void btnFirst_Click(object sender, EventArgs e)
        {
            PageCurrent = 1;
            this.Bind();
        }
        //上一页  
        /// <summary>  
        ///   
        /// </summary>  
        /// <param name="sender"></param>  
        /// <param name="e"></param>  
        private void btnPrev_Click(object sender, EventArgs e)
        {
            PageCurrent -= 1;
            if (PageCurrent <= 0)
            {
                PageCurrent = 1;
            }
            this.Bind();
        }
        /// <summary>  
        /// 下一页  
        /// </summary>  
        /// <param name="sender"></param>  
        /// <param name="e"></param>  
        private void btnNext_Click(object sender, EventArgs e)
        {
            this.PageCurrent += 1;
            if (PageCurrent > PageCount)
            {
                PageCurrent = PageCount;
            }
            this.Bind();
        }
        /// <summary>  
        /// 最后页  
        /// </summary>  
        /// <param name="sender"></param>  
        /// <param name="e"></param>  
        private void btnLast_Click(object sender, EventArgs e)
        {
            PageCurrent = PageCount;
            this.Bind();
        }
        /// <summary>  
        /// 转到新页  
        /// </summary>  
        /// <param name="sender"></param>  
        /// <param name="e"></param>  
        public void btnGo_Click(object sender, EventArgs e)
        {
            if (!String.IsNullOrEmpty(txtPagecount.Text))
            {

                if (int.Parse(txtPagecount.Text) > 0 && int.Parse(txtPagecount.Text) < PageCount)
                {
                    PageCurrent = int.Parse(txtPagecount.Text);
                    this.Bind();
                }

            }

        }

        private void btnNext_Click_1(object sender, System.EventArgs e)
        {

        }
    }
    /**/
    /// <summary>  
    /// 自定义事件数据基类  
    /// </summary>  
    public class EventPagingArg : EventArgs
    {
        private int _intPageIndex;
        public EventPagingArg(int PageIndex)
        {
            _intPageIndex = PageIndex;
        }
    }
}